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Photoactive nanostructure and method of manufacturing same

a technology of photoactive nanostructure and manufacturing method, which is applied in the direction of immunoglobulins, peptide sources, peptides, etc., can solve the problems of increasing processing difficulty

Inactive Publication Date: 2011-01-20
OHIO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0012]According to an aspect of some embodiments of the present invention there is provided a nanostructure. The nanostructure comprises at least one semiconductor nanoparticle bound to a photocatalytic unit of a photosynthetic organism. In various exemplary embodiments of the invention the nanoparticle and the binding between the nanoparticle and the photocatalytic unit are selected such that transfer of electrons from the photocatalytic unit to the nanoparticle is prevented or suppressed relative to transfer of excitons from the nanoparticle to the photocatalytic unit.

Problems solved by technology

Traditionally, microscopic devices have been formed from larger objects, but as these products get smaller, below the micron level, this process becomes increasingly difficult.

Method used

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  • Photoactive nanostructure and method of manufacturing same
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  • Photoactive nanostructure and method of manufacturing same

Examples

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Effect test

example 1

Fabrication of Oriented Multilayers of Photosystem I Proteins on Solid Surfaces by Auto-Metallization

[0229]Materials and Methods

[0230]Site-directed mutagenesis: For site-directed mutagenesis in the psaB gene from Synechocystis sp. PCC 6803 was induced by homologous recombination using plasmids pZBL for induction of cysteine Y634C mutations and pBLΔB for psaB interruption in recipient cells, as previously described [L. Frolov, Y. Rosenwaks, C. Carmeli, I. Carmeli, Adv. Mater. 2005, 17, 2434; M. T. Zeng, X. M. Gong, M. C. Evans, N. Nelson, C. Carmeli, Biochim. Biophys. Acta 2002, 1556, 254; X. M. Gong, R. Agalarov, K. Brettel, C. Carmeli, J. Biol. Chem. 2003, 278, 19141].

[0231]Isolation and characterization of PS I complexes: PS I was isolated from thylakoid membranes by solubiliztion with n-dodecyl β-D-maltoside and purification on DEAE-cellulose columns and on a sucrose gradient. The isolation of PS I, the analysis chlorophyll content and photochemical activity determined by flash-i...

example 2

A Hybrid Nanostructure Composed of a Photo-Synthetic System and Metal Nanoparticles: Plasmon Enhancement Effect

[0246]Materials and Methods

[0247]Fabrication of NP / PSI hybrids: Hybrid metal NP PS I were fabricated by direct covalent binding between NP and PSI. Cysteine mutants at the oxidizing end of PS I were bound to the metal NP by formation of sulfide bond between the cysteine thiols and the metal. NPs were fabricated by reduction of 1 mM solution of AuCl3 and AgNO3 by BH4 in the presence of 5 nM PSI.

[0248]Model of Hybrid Photosystem: The present embodiment incorporates a photosystem I (PS I) reaction center and a single metal NP (FIG. 9). The PS I reaction center from cyanobacteria (Synechocystis sp. PCC6803) is conjugated with a metal NP through a biolinker. The PS I reaction center is composed of the following elements / cofactors: a chlorophyll dimer (special pair, P), two pairs of chlorophylls (eC-B2 / eC-A3 and eC-A2 / eC-B3), two quinone molecules (QA(B)), and the iron-sulfur cen...

example 3

Supporting Data for Hybrid Metal Nano Particles Ps I

[0262]As shown in Example 2, the efficiency of chemical energy production PS I is strongly enhanced in the presence of metal nanoparticles (NP). In the case of photo-transport experiments with the photosynthetic reaction centers, the plasmon resonance generated in the NP enhances the chlorophyll's absorption and increases the photocurrent response in PS I. The type of metal used and the size of the NP can be tuned to generate plasmon with energy that can efficiently enhance the absorption by PS I. For example, the present inventors calculated that gold or silver coated silicon nanoparticles of 21 nm in diameter will generate plasmon resonance frequency that enhance the absorption of light by PS I at peak absorption at about 700 nm. Plasmons are tuned to the energy that overlaps the absorption of PSI to efficiently enhance absorption at the two absorption maxima of PS I. The present inventors also calculated that light energy can en...

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Abstract

A nanostructure comprising at least one semiconductor nanoparticle bound to a photocatalytic unit of a photosynthetic organism is disclosed. The nanoparticle and a binding between the nanoparticle and the photocatalytic unit are selected such that transfer of electrons from the photocatalytic unit to the nanoparticle is prevented or suppressed relative to transfer of excitons from the nanoparticle to the photocatalytic unit. Uses of same and methods of fabricating devices with same are also disclosed. Nanostructures comprising electrically conductive nanoparticles are also disclosed.

Description

RELATED APPLICATION / S[0001]This application claims the benefit of priority from U.S. Patent Application No. 61 / 064,168 filed Feb. 20, 2008, the contents of which are incorporated by reference as if fully set forth herein.FIELD AND BACKGROUND OF THE INVENTION[0002]The present invention, in some embodiments thereof, relates to a photoactive nanostructure comprising one or more solid nanoparticles bound to a photocatalytic unit. The present invention also relates to fabrication of devices with multi-layers of photocatalytic units.[0003]Nanoscience is the science of small particles of materials and is one of the most important research frontiers in modern technology. These small particles are of interest from a fundamental point of view since they enable construction of materials and structures of well-defined properties. With the ability to precisely control material properties arise new opportunities for technological and commercial development and applications of nanoparticles have b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/46C07K14/415C07K14/195H01L51/48H10K99/00
CPCB82Y10/00C07K14/415Y02E10/549H01L51/426H01L51/0093H10K85/761H10K30/35H10K30/50
Inventor CARMELI, CHANOCHCARMELI, ITAIFROLOV, LUDMILARICHTER, SHACHARROSENWAKS, YOSSIGOVOROV, ALEXANDER
Owner OHIO UNIV
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